Are Blender 2.8 Halo Particles meant to render? [EDIT: Or ANY particle, for that matter!]
I don't know about Eevee because I'm still working with Cycles even in 2.8, but in Cycles halo objects don't render.

The workaround I use is to render particles as objects. I either use planes with halo images mapped to them as textures, or I use tiny icospheres with an emission shader and use the compositor to make them glow.